5-9 USING THE X-INTERCEPT MISS BATTAGLIA – ALGEBRA 1 CP OBJECTIVE: USE THE X-INTERCEPT OF A LINEAR EQUATION TO SOLVE THE RELATED ONE-VARIABLE EQUATION.

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Presentation transcript:

5-9 USING THE X-INTERCEPT MISS BATTAGLIA – ALGEBRA 1 CP OBJECTIVE: USE THE X-INTERCEPT OF A LINEAR EQUATION TO SOLVE THE RELATED ONE-VARIABLE EQUATION.

WARM UP Think of a business that you would like to start. What would you need to buy to set up the business? How will you know when you’ve made a profit?

WORK WITH A PARTNER 1.Solve the equation x + 4 = 0. 2.A. Graph the function y = x + 4 B. What is the value of x when the line crosses the x-axis? C. What is the value of y when the line crosses the x-axis? 3. Compare your results from Questions 1 & 2. What do you notice?

Solve x – 2 = - 5 by graphing. 1. Write the equation so that one side is 0. 2.Replace 0 with a y to write a function. 3.Graph the function. Find the x-intercept.

SOLVE BY GRAPHING 2x + 4 = 0

USE A GRAPHING CALCULATOR Find the solution of 5x – 12 = 0

BUSINESS When you start a business, people want to know the break-even point, at which their income equals their expenses. Suppose you invested $140 to start a business selling painted t- shirts. You sell each shirt for $7.50. Find the break even point.

CLASSWORK/ HOMEWORK P. 258 #8-18 even